SunnyMcBlock
New member
I bought a '03 4x4 with the 4.7 V8. I bought it off a used lot so I have very little information on the history of the vehicle or its mods. It has had quite a few modifications and it seems like few expenses were spared by the previous owner.
I had it in the shop(back to the dealership actually) to have the timing belt replaced. Since I have had that work done my Ass Dyno tells me that the rig feels less "peppy." Specifically it seems more reluctant to down shift and rap the RMPs up starting from, say, 25mph up to highway speeds. Before if I put the skinny pedal down past 60% the 4runner seemed to go completely loco kicking down the transmission and roaring the engine. Now, as is said, it feels more reluctant. It seems more tame, more apt to stay in a given gear and accelerate at a more civilized pace.
Performance wise, from what I can see it has a K&N CAI and a Jet Performance Mass air flow sensor installed, as well as a Magnaflow cat back exhaust. Mostly because of the upgraded mass air flow sensor, I wonder if the ECU also had some sort of aggressive programming in it that may have been(inadvertently?) reset to factory settings during the timing belt service.
I'll admit i'm pretty novice in this regard. Does that make sense to anyone? Any other ideas or thoughts? I'd appreciate any feed back.
Thanks.
I had it in the shop(back to the dealership actually) to have the timing belt replaced. Since I have had that work done my Ass Dyno tells me that the rig feels less "peppy." Specifically it seems more reluctant to down shift and rap the RMPs up starting from, say, 25mph up to highway speeds. Before if I put the skinny pedal down past 60% the 4runner seemed to go completely loco kicking down the transmission and roaring the engine. Now, as is said, it feels more reluctant. It seems more tame, more apt to stay in a given gear and accelerate at a more civilized pace.
Performance wise, from what I can see it has a K&N CAI and a Jet Performance Mass air flow sensor installed, as well as a Magnaflow cat back exhaust. Mostly because of the upgraded mass air flow sensor, I wonder if the ECU also had some sort of aggressive programming in it that may have been(inadvertently?) reset to factory settings during the timing belt service.
I'll admit i'm pretty novice in this regard. Does that make sense to anyone? Any other ideas or thoughts? I'd appreciate any feed back.
Thanks.
